I think I'm gonna try blow (my first instinct... no pun intended!). I think I read that it's the best in this situation, but I can't quite rememeber. If the blue orb blows air onto the heatsink, it makes sense that another video card cooler would. The heatsink is quite small, and there's not much air in the gaps/fins of the HS to suck out. Also, I guess, if it blows the air onto the HS, the hot air will go out the sides, and my fan at the back of the case will blow some of that hot air out the case. Damn, cooling is so important to the function of a computer!
Thanks for all the feedback. It's clear that there's advantages to both!